VeritasPrepKarishma wrote:
Bunuel wrote:
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Line J passes through the points (– 5, – 1), (2, 2), and (5, Q). What is the value of Q?
A. 3
B. 3 1/7
C. 3 2/7
D. 3 3/7
E. 3 1/2
Kudos for a correct solution.I am surprised no one has solved this question yet!
Using the slope concept, if x co-ordinate increases by 7 (from (– 5, – 1) to (2, 2)), y co-ordinate increases by 3 (from -1 to 2). So when x co-ordinate increases by further 3 (from 2 to 5), the y co-ordinate will increase by (3/7)*3 = 9/7 = 1 (2/7)
So y co-ordinate will become 2 + 1(2/7) = 3 (2/7)
Answer (C)
Responding to a pm:
Quote:
I really did not understand how did u get 2 ahead of 9/7.
Also, the concept of slopes that you used, can u explain it to me. I do understand that slopes is rise/ run. or I have read it in school as Tan angle that line makes with x -axis. Now, the approach you used I drew inference that Slope is with an increase in an x coordinate the y coordinate increases with according to slope .
If you write \(\frac{9}{7}\) in mixed fractions, you get \(1\frac{2}{7}\).
As for the slope concept, I have explained it in detail in this blog post:
https://anaprep.com/geometry-using-slop ... fectively/Take a look and get back to me if any doubts remain.
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